Customize Daily.php

Hi:
I want customize the template daily.php , then I’m using WP_query()

For test, it works fine! but only for test.

Daily does not send any mail, I have this log:

2013-08-27 02:56:55 000000 --  **** Start logging **** mp_sched_proc_newsletter *** level : 8191 **** (5.4) **** /wp-cron.php?doing_wp_cron=1377572212.4002320766448974609375
2013-08-27 02:56:55 000000 -- !------------------------------------------------------------------------------------------------------------------------------------------------------!
2013-08-27 02:56:55 000000 -- !     Scheduling Newsletters    event : ** Twice daily **                                                                                              !
2013-08-27 02:56:55 000000 -- !------------------------------------------------------------------------------------------------------------------------------------------------------!
2013-08-27 02:56:55 000000 -- ! Newsletter id                  ! scheduler            ! processor            ! timestamp  ! time                                                     !
2013-08-27 02:56:55 000000 -- !------------------------------------------------------------------------------------------------------------------------------------------------------!
2013-08-27 02:56:55 000000 -- ! daily                          ! day                  ! day-1                ! 1377561601 ! Martes 27th of agosto 2013 00:00                         !
2013-08-27 02:56:55 000000 -- !------------------------------------------------------------------------------------------------------------------------------------------------------!
2013-08-27 02:56:55 000000 --  **** End   logging **** mp_sched_proc_newsletter *** level : 8191 **** status : TRUE

Can I use WP_query() in a template of Mailpress?
How it works daily.php? actually sends daily post and these are repeated? or send only new post?

https://www.ads-software.com/plugins/mailpress/